a 100% Natural Organic SuperFood ingredient. Prebiotics promote the growth and activity of the normal flora which, in turn, improves the digestive system, boosts the immune system and enhances the absorption of nutrients and minerals from our diets. Prebio Manna is a mixture derived from Acacia Senegal. It contains more than 85% prebiotic fibers (polysaccharides and oligosaccharides) that are easily fermented by beneficial bacteria.